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Power Electronics

Power Electronics
Power transistor are type of

 IGBTs.
  All of above.
 BJTs.
 MOSFETs.

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Power Electronics
When the temperature increases, the intrinsic stand off ratio ___________.

Decreases
Increases
Essentially remains the same
None of these

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

 Rise time.
 Delay time.
 Same for every case.
  Spread time.

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Power Electronics
Spread time is defined as the interval during which

  anode current rises from 90 % to its final value.
 anode voltage drops from 10 % of its initial value to zero.
 anode current rises from 10 % to 90 % of its final value.
 both (A) and (B).

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Power Electronics
COOLMOS device can be used in application up to power range of

 1 KVA.
 500 VA.
 100 KVA.
  2 KVA.

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Power Electronics
The turn-on time of an SCR with inductive load is 20 µs. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will

  Turn on.
 Not turn on.
 Turn on if inductance is removed.
 Turn on if pulse frequency us increased to two times.

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